In this appendix, we will derive the cross section which depends on
the impact parameter \(\mathbf {b}_{T}\) . We assume the wave functions
of two colliding nuclei moving in \(\pm z\)  direction (see Fig. REF )
can be written in the form of wave packets following the argument
of Ref. [1]},
\(\left|A_{1}\right\rangle & = & \int \frac{d^{3}P_{1}}{(2\pi )^{3}\sqrt{2E_{P1}}}\phi (P_{1})e^{ib\cdot P_{1}}\left|P_{1}\right\rangle ,\nonumber \\\left|A_{2}\right\rangle & = & \int \frac{d^{3}P_{2}}{(2\pi )^{3}\sqrt{2E_{P2}}}\phi (P_{2})\left|P_{2}\right\rangle ,\) 
